:root {
  --color-surface: #f6f6f6;
  --color-surface-alt: #ededed;
  --color-surface-deep: #e0e1e0;
  --color-ink: #404a40;
  --color-ink-soft: #626f63;
  --color-ink-muted: #798679;
  --color-line: #d5d7d5;
  --color-primary: #27862d;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #d9e6da;
  --color-accent: #7222dd;
  --color-accent-ink: #ffffff;
  --color-highlight: #ded0f2;
  --color-focus: #7016e9;
  --color-contrast-surface: #0f1910;
  --color-contrast-ink: #e4e7e4;
  --color-contrast-line: #3e463f;
  --color-contrast-accent: #9c65e7;
  --overlay-scrim: linear-gradient(180deg, rgba(15, 25, 16, 0.35) 0%, rgba(15, 25, 16, 0.72) 55%, rgba(15, 25, 16, 0.92) 100%);
  --font-heading: "Source Han Serif SC", "Songti SC", Georgia, serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 12.2px;
  --text-sm: 15.2px;
  --text-base: 17px;
  --text-lg: 21.2px;
  --text-xl: 26.6px;
  --text-2xl: 33.2px;
  --text-3xl: 41.5px;
  --text-4xl: 51.9px;
  --text-display: clamp(40px, 8.2vw, 105px);
  --text-figure: clamp(33px, 5.9vw, 76px);
  --weight-heading: 716;
  --weight-body: 400;
  --leading-body: 1.73;
  --leading-heading: 1.29;
  --tracking-heading: 0.004em;
  --radius-sm: 1px;
  --radius-md: 2px;
  --radius-lg: 4px;
  --radius-pill: 4px;
  --border-thin: 1px;
  --border-thick: 2px;
  --shadow-1: 0 1px 0 rgba(64, 74, 64, 0.12);
  --shadow-2: 0 2px 0 rgba(64, 74, 64, 0.18);
  --space-1: 6px;
  --space-2: 12px;
  --space-3: 18px;
  --space-4: 24px;
  --space-6: 36px;
  --space-8: 48px;
  --container: 1200px;
  --measure: 71ch;
  --gutter: 18px;
  --section-y: 76px;
  --section-y-lg: 106px;
}

/* ============================================================
   n体育看台 — /assets/site.css
   1 reset · 2 中文排版 · 3 布局与栅格 · 4 通用组件
   5 站点头部 · 6 站点页脚 · 7 焦点与降级
   ============================================================ */

/* ---------- 1 reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, dt { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, picture, video, canvas, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
#main-content { display: block; scroll-margin-top: var(--space-6); }

/* ---------- 2 中文排版 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}
h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
h5, h6 { font-size: var(--text-base); font-family: var(--font-heading); font-weight: var(--weight-heading); }
strong, b { font-weight: 700; }
::selection { background: var(--color-highlight); color: var(--color-ink); }

.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
}
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}
.kicker {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
.display-lg {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 0.96;
  letter-spacing: -0.012em;
  margin: 0;
}
.figure-num {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

/* ---------- 3 布局与栅格 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}
.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.measure { max-width: var(--measure); }

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}
.col-1 { grid-column: span 1; }
.col-2 { grid-column: span 2; }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-10 { grid-column: span 10; }
.col-11 { grid-column: span 11; }
.col-12 { grid-column: span 12; }
.col-start-1 { grid-column-start: 1; }
.col-start-2 { grid-column-start: 2; }
.col-start-3 { grid-column-start: 3; }
.col-start-4 { grid-column-start: 4; }
.col-start-5 { grid-column-start: 5; }
.col-start-6 { grid-column-start: 6; }
.col-start-7 { grid-column-start: 7; }
.col-start-8 { grid-column-start: 8; }

/* ---------- 4 通用组件 ---------- */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-3);
  margin-bottom: var(--space-6);
}
.section-no {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}
.section-title {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  margin: 0;
}
.section-sub {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.breadcrumb {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-4);
}
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: var(--space-1); align-items: baseline; }
.breadcrumb li { display: inline-flex; align-items: baseline; }
.breadcrumb li + li::before {
  content: "/";
  margin-inline-end: var(--space-1);
  color: var(--color-line);
}
.breadcrumb a { color: var(--color-ink-soft); }
.breadcrumb a:hover { color: var(--color-ink); text-decoration: underline; text-underline-offset: 3px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 10px 16px;
  border: var(--border-thin) solid var(--color-ink-soft);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 140ms ease, color 140ms ease, border-color 140ms ease;
}
.btn:hover { background-color: var(--color-contrast-surface); border-color: var(--color-contrast-surface); color: var(--color-contrast-ink); text-decoration: none; }
.btn--primary { background-color: var(--color-primary); border-color: var(--color-primary); color: var(--color-primary-ink); }
.btn--primary:hover { background-color: var(--color-contrast-surface); border-color: var(--color-contrast-surface); color: var(--color-contrast-ink); }
.btn--accent { background-color: var(--color-accent); border-color: var(--color-accent); color: var(--color-accent-ink); }
.btn--accent:hover { background-color: var(--color-contrast-surface); border-color: var(--color-contrast-surface); color: var(--color-contrast-ink); }
.btn--quiet { border-color: var(--color-line); color: var(--color-ink-soft); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px 7px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-alt);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  white-space: nowrap;
}
.tag--confirmed { background-color: var(--color-primary); border-color: var(--color-primary); color: var(--color-primary-ink); }
.tag--corroborated { background-color: var(--color-highlight); border-color: var(--color-highlight); color: var(--color-ink); }
.tag--pending { background-color: transparent; border-color: var(--color-accent); color: var(--color-accent); }

.card {
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
}
.card--deep { background-color: var(--color-surface-deep); }
.card--dark {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.card__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  margin-bottom: var(--space-2);
}
.card--dark .card__title { color: var(--color-contrast-ink); }
.card__meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}
.card--dark .card__meta { color: var(--color-contrast-accent); }

.media {
  position: relative;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface-deep);
}
.media > img,
.media > picture,
.media > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media--wide { aspect-ratio: 16 / 9; }
.media--panorama { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--portrait { aspect-ratio: 4 / 5; }
.media--tall { aspect-ratio: 3 / 5; }
.media__scrim {
  position: absolute;
  inset: 0;
  background-image: var(--overlay-scrim);
}
.media__caption {
  position: absolute;
  inset-inline: 0;
  inset-block-end: 0;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-ink);
}

.rule-ticks {
  position: relative;
  height: 6px;
  margin-block: var(--space-6);
  border-top: var(--border-thin) solid var(--color-line);
}
.rule-ticks::before {
  content: "";
  position: absolute;
  inset-block-start: 0;
  inset-inline-start: 0;
  width: 120px;
  height: 5px;
  background-image: repeating-linear-gradient(90deg, var(--color-ink-muted) 0 1px, transparent 1px 10px);
  opacity: 0.75;
}

.overlap-layer { position: relative; z-index: 2; }
.overlap-top { margin-block-start: calc(-1 * var(--space-6)); }
.overlap-start { margin-inline-start: calc(-1 * var(--space-6)); }

.ledger {
  width: 100%;
  font-size: var(--text-sm);
}
.ledger caption {
  text-align: start;
  padding-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}
.ledger th,
.ledger td {
  text-align: start;
  padding: 10px var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  vertical-align: baseline;
}
.ledger thead th {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  border-bottom: var(--border-thick) solid var(--color-ink-soft);
}
.ledger tbody tr:nth-child(even) { background-color: var(--color-surface-alt); }
.ledger td.num, .ledger th.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.ledger--dark {
  color: var(--color-contrast-ink);
  background-color: var(--color-contrast-surface);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-lg);
}
.ledger--dark caption { color: var(--color-contrast-accent); }
.ledger--dark th,
.ledger--dark td { border-bottom-color: var(--color-contrast-line); }
.ledger--dark thead th { color: var(--color-contrast-accent); border-bottom-color: var(--color-contrast-line); }
.ledger--dark tbody tr:nth-child(even) { background-color: color-mix(in srgb, var(--color-contrast-surface) 82%, var(--color-contrast-ink)); }

.expand-group { border-top: var(--border-thin) solid var(--color-line); }
.expand { border-bottom: var(--border-thin) solid var(--color-line); }
.expand__trigger {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  cursor: pointer;
  list-style: none;
  color: var(--color-ink);
  transition: background-color 140ms ease, padding 140ms ease;
}
.expand__trigger::-webkit-details-marker { display: none; }
.expand__trigger:hover { background-color: var(--color-surface-alt); }
.expand__no {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-accent);
}
.expand__label {
  flex: 1 1 auto;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
}
.expand__state {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}
.expand__state-close { display: none; }
.expand[open] > .expand__trigger { background-color: var(--color-highlight); padding-inline: var(--space-2); }
.expand[open] > .expand__trigger .expand__state-open { display: none; }
.expand[open] > .expand__trigger .expand__state-close { display: inline; }
.expand__panel { padding: 0 var(--space-2) var(--space-4); }

.filter-bar { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.filter-tag {
  padding: 6px 10px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background-color 140ms ease, color 140ms ease, border-color 140ms ease;
}
.filter-tag:hover { border-color: var(--color-ink-soft); color: var(--color-ink); }
.filter-tag[aria-pressed="true"],
.filter-tag[data-active="true"] {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.reveal { transition: opacity 240ms ease, transform 240ms ease; }
[data-reveal="on"] .reveal { opacity: 0; transform: translateY(10px); }
[data-reveal="on"] .reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 5 站点头部 ---------- */
.skip-link {
  position: absolute;
  inset-inline-start: var(--space-3);
  inset-block-start: -100px;
  z-index: 120;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
}
.skip-link:focus { inset-block-start: var(--space-2); }

.site-header {
  position: relative;
  z-index: 70;
  background-color: var(--color-surface);
}
.scroll-progress {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  height: 3px;
  z-index: 90;
  background-color: color-mix(in srgb, var(--color-contrast-surface) 22%, transparent);
  pointer-events: none;
}
.scroll-progress__fill {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background-image: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
  transition: transform 120ms linear;
}

.ticker-bar {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}
.ticker-bar__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-1) var(--space-4);
  min-height: 30px;
  padding-block: 5px;
}
.ticker-bar__item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}
.ticker-bar__item::before {
  content: "";
  width: 5px;
  height: 5px;
  background-color: var(--color-primary);
}
.ticker-bar__item--accent { color: var(--color-contrast-accent); }
.ticker-bar__item--accent::before { background-color: var(--color-contrast-accent); }

.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-3);
}

.brand {
  display: grid;
  grid-template-columns: auto auto;
  grid-template-areas:
    "mark name"
    "mark note";
  align-items: center;
  column-gap: var(--space-2);
  text-decoration: none;
}
.brand__mark {
  grid-area: mark;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  transition: background-color 140ms ease;
}
.brand:hover .brand__mark { background-color: var(--color-accent); }
.brand__name {
  grid-area: name;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1.1;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}
.brand__note {
  grid-area: note;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-2);
  padding: 8px 10px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  color: var(--color-ink);
  cursor: pointer;
  transition: background-color 140ms ease, color 140ms ease, border-color 140ms ease;
}
.nav-toggle__bars {
  display: block;
  width: 16px;
  height: 12px;
  background-image:
    linear-gradient(currentColor, currentColor),
    linear-gradient(currentColor, currentColor),
    linear-gradient(currentColor, currentColor);
  background-repeat: no-repeat;
  background-size: 100% 1.5px, 100% 1.5px, 100% 1.5px;
  background-position: 0 0, 0 50%, 0 100%;
}
.nav-toggle__label { font-size: var(--text-xs); }
.nav-toggle[aria-expanded="true"] {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.site-nav { flex: 0 1 auto; min-width: 0; }
.site-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  counter-reset: nav-item;
  overflow-x: auto;
  scrollbar-width: thin;
}
.site-nav__item {
  counter-increment: nav-item;
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
  flex: 0 0 auto;
}
.site-nav__item::before {
  content: counter(nav-item, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}
.site-nav__link {
  display: inline-block;
  padding: 6px 8px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  white-space: nowrap;
  transition: background-color 140ms ease, color 140ms ease, border-color 140ms ease;
}
.site-nav__link:hover {
  color: var(--color-ink);
  border-color: var(--color-line);
  text-decoration: none;
}
.site-nav__link[aria-current="page"] {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.site-nav__item:has(.site-nav__link[aria-current="page"])::before { color: var(--color-accent); }

.header-rule {
  height: 5px;
  border-top: var(--border-thin) solid var(--color-line);
  background-image: repeating-linear-gradient(90deg, var(--color-line) 0 1px, transparent 1px 18px);
  background-repeat: repeat-x;
  background-size: 18px 4px;
  background-position: 0 0;
}

/* ---------- 6 站点页脚 ---------- */
.site-footer {
  margin-top: var(--section-y-lg);
  background-color: var(--color-surface);
  border-top: var(--border-thin) solid var(--color-line);
  padding-block: var(--space-8) var(--space-6);
}
.footer-frame {
  padding: var(--space-6) var(--space-6) var(--space-4);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1.3fr;
  gap: var(--space-6) var(--space-4);
}
.footer-col { min-width: 0; }
.footer-brand {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1.15;
  color: var(--color-ink);
}
.footer-desc {
  margin-top: var(--space-2);
  max-width: 34ch;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}
.footer-note {
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.footer-title {
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}
.footer-list { display: grid; gap: var(--space-1); }
.footer-list a { font-size: var(--text-sm); color: var(--color-ink-soft); }
.footer-list a:hover { color: var(--color-ink); text-decoration: underline; text-underline-offset: 3px; }
.footer-cta { margin-top: var(--space-3); }
.footer-ticks {
  height: 5px;
  margin: var(--space-6) 0 var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  background-image: repeating-linear-gradient(90deg, var(--color-line) 0 1px, transparent 1px 16px);
  background-repeat: repeat-x;
  background-size: 16px 4px;
  background-position: left bottom;
}
.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: center;
  gap: var(--space-2) var(--space-4);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  text-align: center;
}
.footer-meta { font-size: var(--text-xs); color: var(--color-ink-muted); }
.footer-meta + .footer-meta {
  padding-inline-start: var(--space-4);
  border-inline-start: var(--border-thin) solid var(--color-line);
}

/* ---------- 7 焦点、响应式与降级 ---------- */
:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

@media (max-width: 1099px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-col--brand { grid-column: 1 / -1; }
}

@media (max-width: 899px) {
  .section { padding-block: calc(var(--section-y) * 0.62); }
  .section--lg { padding-block: calc(var(--section-y) * 0.8); }
  .grid { grid-template-columns: minmax(0, 1fr); }
  .col-1, .col-2, .col-3, .col-4, .col-5, .col-6,
  .col-7, .col-8, .col-9, .col-10, .col-11, .col-12 { grid-column: span 1; }
  .col-start-1, .col-start-2, .col-start-3, .col-start-4,
  .col-start-5, .col-start-6, .col-start-7, .col-start-8 { grid-column-start: auto; }
  .overlap-top { margin-block-start: calc(-1 * var(--space-3)); }
  .overlap-start { margin-inline-start: 0; }

  .header-bar { padding-block: var(--space-2); }
  .brand__name { font-size: var(--text-lg); }
  .brand__mark { width: 32px; height: 32px; font-size: var(--text-lg); }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute;
    inset-block-start: 100%;
    inset-inline: 0;
    display: none;
    max-height: 70vh;
    overflow-y: auto;
    padding-block: var(--space-2) var(--space-3);
    background-color: var(--color-surface);
    border-top: var(--border-thin) solid var(--color-line);
    border-bottom: var(--border-thin) solid var(--color-line);
    box-shadow: var(--shadow-2);
  }
  .site-nav[data-open="true"] { display: block; }
  .site-nav__list {
    display: block;
    padding-inline: var(--space-3);
    overflow: visible;
  }
  .site-nav__item {
    position: relative;
    display: block;
    gap: 0;
    border-bottom: var(--border-thin) solid var(--color-line);
  }
  .site-nav__item:last-child { border-bottom: 0; }
  .site-nav__item::before {
    position: absolute;
    inset-inline-start: 0;
    inset-block-start: 16px;
  }
  .site-nav__link {
    display: block;
    padding: 13px 8px 13px 34px;
    font-size: var(--text-base);
    border: 0;
  }
  .site-nav__link[aria-current="page"] { border-radius: var(--radius-sm); }

  .footer-frame { padding: var(--space-4) var(--space-4) var(--space-3); }
  .footer-base { gap: var(--space-1); }
  .footer-meta + .footer-meta {
    padding-inline-start: 0;
    border-inline-start: 0;
  }
}

@media (max-width: 599px) {
  .ticker-bar__inner { justify-content: flex-start; }
  .ticker-bar__item { font-size: 11.4px; letter-spacing: 0.04em; }
  .summary, .section-head { gap: var(--space-1); }
  .section-title { font-size: var(--text-2xl); }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal,
  [data-reveal="on"] .reveal { opacity: 1 !important; transform: none !important; }
  .scroll-progress__fill { transition: none; }
}